bpo-37231: remove _PyObject_FastCall_Prepend which is no longer used#14153
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Thanks to #13973, the private function
_PyObject_FastCall_Prependis no longer used, so we can remove it.Note that the implementation is actually buggy: it contains an off-by-1 error in the condition
nargs <= (Py_ssize_t)Py_ARRAY_LENGTH(small_stack)(forgetting to reserve space for the prepended argument). Sincenargswas always at most 2 in all calls of this function, this bug was never noticed.CC @methane
https://bugs.python.org/issue37231